Means for forming star drills



Jan. 13, 1931. M QKAPPEIL 1,788,463

Mmus i 01: FORMING STAR DRILLS Filed Dec. 24, 1927 2 Sheets-Sheet 1 )6 liliil' 1931- M. KAPPEL 1,188,463

MEANS FOR FORMING STAR DRILLS Filed Dec. 24, 1927 2 s eets-sheet 2 Patented Jan. 13, 1931 Messier n vs'm'rss ears unrest, or BEVERLY PLACE, WILMINGTON, nELew n V SYLVAN n. LEVY, or wrLMIne-ron, DELAVIAR-E T es assrenor. To

7 MEANS F011 FORMING DBIILLS Applicationfilecl December 24, 1927. Serial No. 242,396..

t cular adaptation illustrated be- 101 forming star drills or similar ill-Gil products, and the object of the invention being to increase production over the methods now employed in the manufacture of this class merchandise.

ntion relates to forging appara- 1 The details of the device will be fully disand. front elevation of one of the forming (lies; 7 i V 7 Figs. 7 and 8 are respectively a plan and side elevation of one-half of the die holder;

11 and 12 are respectively a plan and levation of a finisheddmll.

the device comprises a base plate 1 hav- I a vertically extending ring 2 secured thereto by means of screws 3. WVithin the ring 2 is a die iolder 4, and within the die holder 4 is a work holder 5. Slidably mounted in the die holder 4 and the work holder 5 is series oi dies 6, in the present instance "four in number, arranged in pairs. The re spective dies of each pair are arranged for movement in opposed relation to each other and the d l erent pairs are arranged at right angles with respect to each other, as shown in Fig. 3. The dies 6, 6 are all adapted for movement radially toward and from a common center. I

Each of the die members 6 comprises a body portion '2, adapted to slide in a groove 8 formed in the die holder. 4, and a reduced blade portion 9 adapted to slidein' a groove i The front 1O formeo in the work holder 5. v edge 11 of each of the blades 9 is beveled adjacent the top edge of the blade, as indicated at 13 (Figs. 4, 5 and 6), said bevel tape ring to Figs. 1-, 2 and 3 of the drawblocks 22, 22.

eringin all directions from the'said topedge 12 of thebladetoacommon point 14 atthe bottom edge 15 of the blade, see Fig. .6. The rearor outer edge oil-each er the dies 6 is inclined as illustrated at, 16, for purposes herematter set forth. I

- The die holder 4 andthe work holder 5 respectwely are split along a common line 22, Fig. 3,.whi'ch divides these elements in- V to separate halves 460,401. and 5a, 5a respectively. v r

The half sections 4a, 4a of the die holder 4 are each provided with a tongue adapted to sllde in gu1de openings 21, 21 formed in the lGSDBCtlVQ sides oi the base ring 2.

Guide blocks 22,22 are carried bythe said base ring 2, and engage fflat faces 23, 23 formedon the opposite sides of the die, holder 4 parallel to the tongues 21.

Behind and in radial alignment with each of the die members 6,-the ring 2 is provided with a vertically extending groove 24. These --groves 24 are substantially the same width as the tongues 21 as seen in Fig. 3. The guide blocks 22, 22 are secured in the grooves 240; which occupy positions at' right angles to the groves 24 located above said tongues.

In each of the said grooves 24 located above the tongues 21 is operably mounted a double Wedge element 25. Each of these double wedge elements-25 includes a central portion 26 having an inclined face 27 which is adapted to cooperate with the inclined face 16 on the die members 6, situated adjacent said tongues 21. At either side'of the central wedge portion 26 is a lateral vertically extending flange 28, provided at the lower end with an inclined face 29 which is adapted to The wedge elements 25,25 extend from .side to side Within the grooves 24,24 which are abovethe tongues 21, 21 respectively while the grooves 24a, lying at right angles to the tongues 21, areoccupied in part by the guide Between the guide blocks 22, 22 each groove 24a is operably mounted awedge ele- ,ment 25ahav1ng an incllnedface 27a which cooperates with the die members 6, 6 which are aligned with the grooves 24a, 24a.

The wedge elements 25, 25 and 25a,25a are formed in the bottom wall 37 of a cup-shaped element 38. The cup-shaped element 88 has a threaded cavity 39 in which is located a nut 40, which engages the threads of the cavity 39, whereby the said nut 40 maybe jammed down tight against the bottom wall37 of the cup element 38. The nut 40 is also provided with a threaded aperture 41 for the reception of thethreads 42 on the wedge shank 35. 'By

1 this 'means the cup-shaped elements 38,38

and the wedge'elements 25,, 25a are-rigidly though removably-heldf together, the cupsh-aped element 38"acting as a head for the wedge25. 1 V

' The threads in the cavity 39 of the head 38 are adapted to receivea threaded stud 43- which isriv eted to a plate 45, and a lock nut "'44 is provided on'the stud 43 between the head 38 and the plate 45. This construction providesfor the removal of the wedge elements 25 from the plate 45, in case of necessity,'and also'provides adjustmentfor said wedge elementsdnbrder that the inclined faces thereof may be properly aligned with the inclined faces 16 of the die members 6 and with the respective halves of the die holder 4. i V

In operation the base plate 1 is secured to the stationary bed of a punching or stamping machine, and the plate 45which acts" as a common carrier forsaid wedge members "'issec'ured to the m'ov'able'head ofthe matrally located opening 47 which is in axial alignment with a cavity 48 formed in the work holder'5." A work receiving opening 50 is'pro'vide'd in the work holder 5 and extends from the cavity 48 therein to the top of the said work holder, and is axially aligned with the common center from which the die memb'ers6, 6 radiate.

Assuming that the movable head of the machine is raised to such .a position that the poin'ts 51 of the wedge members '25, 25a are adjacent the top face of the base ring 2, a preheated blank consisting of asuitable length of tool steehis inserted from underneath, through the opening 47' in the base plate 1, through the cavity 48 formed in the work holder 5 and into the work receivin o'en'n 50 therein'until th u e -end g P 1 g 8 pp r agree with the diameter of the finished product, thereby obviating the necessity of grindof the said blank is substantially flush with the upper edges 12 of the diemembers 6. Insertion of the blank causes the die members 6, 6 to'be moved radially outward by the upper end of the blank engaging-the tapering front edges 11 of the die blades 9.

After the blank is inserted, the movable head of the machine is moved downwardly, the wedge members 25, 25a enter the grooves 24, 24a in the base ring- 2 behind the die memhere 6, 6 and the respectivehalves 4a, 4a of thedie carrier v4. As the movable head of the machine descends the inclined faces 29, 29' of the wedges '25, 25 engage the rounded edgesBO, 30 of the respective halves 4a, 4a of the-die holder 4,-causing thetwo said halves to move toward each other, consequently caus- 7 ing thetwohalves 5a,; 5a of thework holder h to move toward each other until the blank sgripped tightly withinthe work receivmg 0pe'nin'g50 of the saidwork holder 5.

" Continued downward movement of the v wedges 25', 25 causes the inclined faces 27, 27 thereof to engage'the inclined faces 16,16 of the die members 6, 6; At the same time the inclined faces 27a, 27a of the wedge 25a, 25a engage the inclined faces 16, 16 of the die members 6, 6with which they cooperate. As the wedges 25', 25a continuetheir downward "movement, the die members 6, 6 are synchronously "moved "toward the above mentioned common center and 'the'beveled edges 11, 11

of the'rcspective die blades'9 are forced into the heated blank,totheposition illustrated in Fig. 8, thereby making the indentations illustrated at m in the blank m, which produces'finsm m disposed-at right angles to each other. The fins 92 m are later ground asilh strated at 012 42 Figs. 11- and'12 to complet'e the star drill.

After the blank'has been formed,.the direction of movement of the movable head of the machine is reversed and the wedges 25, 25a a'rethereby movedupwardly in the groves 24, 24a, and by' a slight'lateral movement of thec'ompleted blank the die members 6, 6 and the halves 5a, 5a of the work holder 5 are moved sufliciently to loosen the blank relative to these members, after which the blank is withdrawnfrom underneath and a new blank inserted as above noted, after which the cycle of operations is repeated.

ll hile the drawings illustrate a device for forming star drills, it will be obvious to those familiar with theforging art that the device may be used in theformation of any other form of' fluted forged product, and while there arefour dies illustrated in the drawings any desired number of dies may be employed, alsothe die holder and'work holder I may be split into as many individual parts as; may be deemed necessary for a given article and a given number of dies.

Thebore of; thework holder is finished to I claim: I

1. The combination in a device for forging fluted articles of a plurality'oif die members adapted for movement radially withre- .rapect to a common center, and a work holder comprising a plurality of relatively movable sections surrounding said center ior'positioning a blank in coaxial alignment with said center, said workholder having guidcways formed therein for radially guiding said center, said work holder having guideways formed therein for radially guiding said die members relative to said center and tluted articles of a plurality of die members adapted for movement radially with respect to a common center, a die holder for said dies, a work holder comprising a plurality of relatively movable sections surroundlng said center for POSltlOillng and holding a blank in coaxial alignment 'withsaidcenter, and guides formed in said die holder and said a work holder for said die members.

4. The combination in a device for forging fluted articles of a plurality of die members adapted for movement radially with respect to a common center, a die holder for said dies, a workholder comprising a plurality of relatively, movable sections surrounding said center for positioning and holding a blank in-coaxial alignment with said center, guides formed in said die holder and said work holder for said die members, and means for synchronously moving'said die members toward said common center and into said blankg 5. In a device for forging fluted articles, the combination of a base element, a plurality of die members adapted for movement radially with respect to a common center, a holder for said die members located'within said base element, a work holder comprising a plurality of relatively movable sections surrounding said center for positioning and holding a blank in coaxial alignment with said common center, guideways formed in said die holder and said work holder for said die members, and wedge members operable between said die members and said base element for moving said die members toward said common center and into said blank;

6. In a device for forging fluted articles,

radially with respect to: a common center,

a holder for saiddie. members located within said base elements, a work holder comprising a plurality of relativelymovable sections surrounding said center for positioning and holding a blank in coaxial alignment with said common center, guideways formed in said die' holder and said work holder for said die members, edge members operable be? tween said die members and said base element for moving said die members toward said common center and intosaid blank, and means for synchronously moving said wedge'members for-effecting a synchronized movement of said die members. a

7. In a device forfforging fluted articles, the combination of a base element, aplurality of die members adapted-for movement radiallyWith respect to a common center,.a holder for said die members; located Within said base element, a work holdercomprisinga plurality of relatively movable sectionssurrounding' said center for positioning and holding a blank 1n coaxial allgnment wlthsald common "center, guideways formed in said die holder and said work holder for said. die members, wedge members operable between said d1e members and said'base element for moving said die members toward said common center and into said blank, means for synchronously moving said wedge members for effecting a synchronized movement of said die members, and guideways formed in said base element forsaid wedge members." I

8. Ina device. for forgingfluted articles, the combination of a baseelement, a plurality of die members adapted for movement radially with respect to a common center, aholder for said die members comprisinga plurality of separate elements slidably mounted within said baseelement, a work holder comprising a plurality of separate elements respectively located within the said separate elements of said guide holder, guideways formed in said CllG.l10ldI-2lIlCl said workholder for said die elements,-means for m ving the respective elements of said die holder and said work holder toclampa blank in-position' in axial alignment with said center, and means for moving said die members relative to said die holder and said work holder to engage the or" separate elements slidably mounted within said base element, a work holder comprising a plurality of separate elementsrespectively located within the said-separate elements of said die holder, guideways formed in said die holder and said Work holder for said die ele- .ments, means for moving the respective elements of saiddleiholder and said WOTlI'llOlClGl ,to'iclamp a: blankin position i-n=.-akial..alignment with said center,-meansiforimovingsaid the members relative to: :said idie'iholderi and said work holder to "engagevtlieblank,and

mon center, a. holder for said die members comprising. aplurality of separate {elements slidably mounted in said base element for movement toward and from s'aidicenter, a work holder comprising a pluralityof separate elements respectively carried by theielements of saiddie holder,guidewaysformed in said die holder and :said 'work'holderzele- .ments'for said die members, aseries of wedge members having operating faces-for. operating the said die liolder andfwork holderelementsto 'grip a blank incoaxial-alignment with said common center andhaving operating faces for operating-a portion of the series of thesaid d1e.niembers, aiid asecond series of wedge members-having operating faces forithe remainder: of die members,

11; In a device-forfoi'ging fluted-articles, the combination of a base element,.a13li1r.ality of die members in said base element adapted for radialmovement .with'respect to a-common center, a holder'for. saidrdie-inembers comprising a plurality of: separate: elements slidably mounted in said base element ;for movement toward and from saidicenter, a work holder comprising; a plurality :of separate elements respectively carried byttheielements of said die :holder, guidewaysformed in said die holder andrsaidiworkfholder-elements for said the members, a series-of'zwedge members having operating .faces ;for-"operat ing the said-die holderandtwork-holdenelements to grip ablankincoaxizil alignment with said common center andoperating faces for operating. a: portion of the 'seri esrof 'the said die members, a: second nseriesiofzwedge members having operating; facesforcthe. re-.

mainder of die members, {111K153 common carrier for all of said wedgei'members;

12. Ina device for forging fiutedarticles, the combination of azplurality of diefimembers adapted for movement radially with-:respect' to a common center,:nieanstfor posit oning and maintaining? a blank: iiiscoaxial alignment with said center, :a plurality .of

wedge memberslfor operating; saididie iinembers and said blank maintaining; means,-ta

common carrieriforsaidwe'dge members,1and

means for adjustably securingceachzofi'said wedge membersto saidcommon GHJIIIBI'J'COIII- prising. an externally threadedstud immovably secured to said co ninonz carrier, an internally threaded I cupssha ped element'- .adjustably mounted i on said' stud, a; shank on said iwedgemember extending :1 through. an

element, a-.lock nutinthe cupelement between the bottom thereof and the end of the stud said i look nutbeing; threaded onto. the.

endof-the said wedge shank, and a lock nut on said stud between the-common carrier and the cup element and adapted-to engage the said cup element.-

.13. In a device forforgingfluted articles,

th'ecombination offla plurality ofdie mem-' bers each of which comprises a'bodyportio i and a blade portion, a holder for said die members "comprising a plurality of individual'elements'haviiig grooves for slidably receiving'the body portions of said die members, aworkholder comprisinga plurality of individual elements having grooves for slidably receiving the said blade portions of said die-members, said die'holder elements,

' said work holder elementsaiid said die memtween said base element and saiddie' members and between the base element and the die holder elements, andguideways formed in said base element-for said wedge elements.

14. In adevicefor forgingfiuted articles, the combination of a pluralityiof die members adapted formovement radially with respect to a common'center, a work holder com-.

prising a plurality of relatively movable sec- -131OI1S surrounding said'centerfor positioning a blank in coaxial alignment'with said center, aholder for said-die-members, each die member comprising; a body portion adapted toslide: in -a groove-formed in said die holder and a blade; portion adapted to slide in a groove formed in: said" work holder, each blade portion having a-beveled edge adjacent 'said common center adapted topenetrate the side faces of said blank, and 'means for operatinghsaid die. members.

15. In a device for forging'flutedarticles, the combination of a-base element comprising a:base.plate and a base --ri-ng;rigidly-. secured thereto, a plurality of die members adapted for'radial movement with respect to a common center coincident with the center, of said base ring, a split holder; for said die members comprising a pluralityof independ ent elements slid-ably mountedonsaid base plate within said'base ring,atongue on each of said elements adapted.- to slide, in vagroove formed in said-base ring, Q SPLItXVV OI'lIIIIOIdQI' comprising .aplurality :of independent elements carried by the elements of said die holder respectively, wedges for-operating said die holderand said work holding elementsfor grippingran'd maintaining a blank in coaxial alignmentwith the (SQIltGIZOf said base. ring, wedgesifor operating. said. die; members,

for radial movement with respect to a com- 1 men center coincident with the center of said base ring, a split holder for said die members comprising a plurality of independent elements slidably mounted on said base plate within said base ring, a tongue on each of said elements adapted to slide in a groove formed in said base ring, a split work holder comprising a plurality of independent elements carried by the elements of said die holder respectively, wedges for operating said die holder and said work holding elements for a gripping and maintaining a blank in coaxial alignment with the center of said base ring, wedges for operating said die members, grooves formed in said base ring for guiding said wedges in operative alignment with the elements operated thereby, guide blocks located in the wedge guide grooves positioned c adjacent the split in said die holder and adapted to be engaged by the sides of the respective elements of said die holder, and a common carrier for saidwedges adapted to synchronously move said Wedges in said guide grooves. i a g 17. In a device for forging fluted articles, the combination of a base element comprising a base plate and a base ring rigidly secured thereto, a plurality of die members adapted for radial movement with respect to a common center coincident with the center of said base ring, a split holder for said die members comprising a plurality of independent elements slidably mounted on said base plate within said base ring, a tongue on each of said i elements adapted to slide ina groove formed in said base ring, a split work holder comprising aplurality of independent elements car ried by the elements of said die holder respectively, wedges for operating said die holder and said work holding elementsfor gripping and maintaining a blank in coaxial alignment with the center of said base ring,

wedges for operating said die members,

. grooves formed in said base ring for guiding said wedges in operative-alignment with the elements operated thereby, guide blocks 10- cated in the wedge guide grooves positioned" adjacent the split in said die holder and adapted to be engaged by the sides of the respective elements of said dieholder, a common carrler for saldwedges' adapted to synchronously move said wedges in" said guide grooves, and means for adjustably securing said wedges to'said common carrier therefor.

MARTIN KAPPEL. 

